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Danielrug05

TPU and bubbles in the printing

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Hi, a few weeks ago i printed some parts in TPU or flex and today i saw the parts like this:

5a334133a2b3f_cap3.thumb.jpg.aa6a318baeed45c2dff1bc27314bb1ae.jpg

cap1.thumb.jpg.5828eba480693bc4b9833278be5d6b44.jpg

cap2.thumb.jpg.de110dd97c71e7fdf84059510e879138.jpg

As you can see on the surface some bubbles started to appear. I stored the parts in a cardboard box for a week or so and i dont know if that could cause this inconvenient. Although, is there any cleaning substance that can cause this?

Thanks

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